FDA pulls J&J COVID vaccine authorization due to low demand.

The FDA has revoked authorization for Johnson & Johnson's COVID-19 vaccine at the request of the company, as the last lots of the vaccine purchased by the US government have expired and there is no demand for new lots. The vaccine faced trouble from the beginning, with a pause in use due to a rare clotting disorder and production issues with a government contractor. The FDA is now preparing to discuss new formulations of COVID-19 vaccines for this fall, with the World Health Organization advising countries to switch to monovalent vaccines targeting the latest omicron sublineage.